will it be make or break for mitt romney? we've got our political dream team of brokaw, gregory and todd all here to weigh in this morning. >>> all right. and then on thursday you'll remember david goggins kicked off his "guinness world record" attempts to do most powellups in 24 hours. well, there's been a significant develop overnight, and we will talk to david about it coming up. >>> but we want to begin with that deadly shooting at a business in minneapolis. nbc's kevin tibbles is there. kevin, good morning to you. >> reporter: savannah, witnesses say the alleged 36-year-old shooter may have been fired from his job here at the accent sign company behind me yesterday morning. it turned an afternoon very tragic when he opened fire on fellow employees. by the time he was done, five were dead, including the shooter himself, who turned the gun on himself. a woman living near this sign company late thursday afternoon says one worker took shelter in her home for about 30 minutes. >> he came running up the side of the front, the